Full Analysis And Technical Connotation Of Drop-out Type Fuse Name Terms
The naming system of High Voltage Fuse is a condensed expression of its technical characteristics, and each terminology unit corresponds to a specific engineering meaning. Based on the GB/T 15166 standard specification, this article systematically deconstructs the professional terms in the equipment name and reveals its intrinsic relationship with the equipment function, structure and performance.
... 1. The mechanical connotation of "drop-off"
... 2. Functional definition of "fuse"
... 3. Coding logic of model prefix "RW"
"R" stands for fuse type (Recloser), "W" stands for outdoor type (Weatherproof). This coding system follows the DL/T 640 standard, in which the rain withstand voltage of "W" type products reaches 28kV, which is 40% higher than that of indoor type.
2. Structural characteristics Terminology Analysis
1. Melt tube type identification
Composite melt tubes are marked with "FH", and their glass fiber content is ≥65%; gas-generating melt tubes are marked with "QC", made of polycarbonate material, and the gas production can reach 150cm³/kA. New ceramic melt tubes are marked with "TC", and the arc-resistant temperature reaches 3000℃.
2. Contact system terminology
"Duckbill contact" is named because of its shape resembling the beak of a bird, and the contact pressure is designed to be 80-120N; the elastic coefficient of the "spring compression structure" is controlled at 50-70N/mm, ensuring that the contact resistance is ≤200μΩ.
3. Arc extinguishing device description
"Longitudinal arc blowing" refers to the arc extinguishing airflow along the axial direction of the melting tube, with a speed of 120m/s; the "double-end step-by-step exhaust" structure can increase the arc voltage gradient to 18V/mm, which is 25% higher than the traditional structure.
3. Performance parameters Definition of terms
1. Voltage level marking
The numerator "10" of "10/100" in the model number represents the rated voltage of 10kV, and its power frequency withstand voltage is 42kV/1min; the denominator "100" represents the rated current of 100A, corresponding to the melt cross-sectional area of 6.3mm².
2. Breaking capacity level
"G" type corresponds to 12.5kA limit breaking, using copper tungsten contacts; "H" type reaches 16kA, using vacuum impregnated arc extinguishing tubes. The breaking time difference is significant: under 10kA fault, G type needs 15ms, H type only 8ms.
3. Environmental adaptability mark
The air gap of the "GY" plateau type has increased by 30%,
"TH" wet and hot type uses silicone rubber shed skirt, which is hydrophobic to HC1 level. "FW" windproof type has double safety buckles, which can withstand 40m/s wind pressure.
... The "D" in the new model stands for Digital, which integrates temperature sensors and wireless transmitter modules; "S" stands for Self-healing, and the contact plating contains nano-silver particles to repair micro-discharge damage. According to the IEEE C37.40 standard, future models will add artificial intelligence identification segments to achieve adaptive adjustment of protection characteristics.
V. Summary
The naming terminology of drop-out fuses is a classic example of standardization of power equipment, and each character carries precise engineering parameters and technical requirements. With the development of smart grids, its naming system is transforming from traditional parameter description to digital expression of functions, but the engineering semantics of core terms will continue to guide the design and application of equipment. Enbimei will also transform the naming system of traditional drop-out fuses into a digital technology carrier through continuous innovation, demonstrate the company's technical strength, and provide standardized guarantees for the safe operation of power systems.
